How do you change the Rotom form?

Rotom can change to many form in the anime. So in the game it can change?

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In Platinum:> Starting in Platinum, Rotom also has five extra forms (each based on a household appliance), which can be accessed by possessing specific appliances.

In HGSS

Rotom’s forms were introduced in Pokémon Platinum by using the WiFiEvent item; Secret Key. However, in Heart Gold & Soul Silver, you donot need this item to access Rotom’s forms

If you take Rotom to Silph Co. and have it at the front of you team,go to the Elevator and you’ll be able to go up to it. Once there,Rotom will power up the elevator and take you to the room. In theroom, select the respective item for Rotom’s forms. You can changeforms at will. To change Rotom out of that form and back to its baseform, just select the tile where Rotom used to be

In Black Version 2 and White Version 2

Rotom’s five alternate forms make a return within this game. When youhave sent Rotom over, you will be able to take Rotom with you to theDepartment Store in Route 9. In this store, there is a room withmultiple storage boxes. Interact with this box and you’ll be able tochange your Rotom’s form. These Rotom all have special attacks thatcan only be used while in that form and they change type.

In Omega Ruby and Alpha Sapphire:

#479 Rotom Location: Littleroot Town

In Professor Birch’s laboratory in Littleroot Town. In the south-eastof the laboratory you will find some cardboard boxes. Interact withthese boxes and Rotom will change its form and learn a new move withthat goes with its form.

Source: Serebii